Benchmark: setAttribute, classList

HTML Preparation code:

<div id="foo"></div>

Tests:

setAttribute
var element = document.getElementById("foo"); element.setAttribute("bar", "");
classList
var element = document.getElementById("foo"); element.classList.add("bar");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
setAttribute
classList

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this JavaScript microbenchmark.

**Benchmark Purpose**
The benchmark measures the performance difference between setting an attribute using `setAttribute()` and adding a class to an element using `classList.add()` on a HTML element with the id "foo".

**Options Compared**

1. **`setAttribute()`**: This method sets the specified attribute(s) on an element.
	* Pros:
		+ Widespread support across browsers, including older versions.
		+ Simple and straightforward syntax.
	* Cons:
		+ May require additional code to handle situations like setting multiple attributes or handling attribute name conflicts.
2. **`classList.add()`**: This method adds one or more classes to an element.
	* Pros:
		+ More efficient and modern approach, especially for adding a single class.
		+ Can be used in combination with other methods (e.g., `classList.remove()`) for more complex class management.
3. **Other alternatives**:

* Setting the `style` attribute directly: This method can also set an attribute value, but it's less efficient and less readable than using `setAttribute()` or `classList.add()`.
	* Using `DOMTokenList`: Introduced in HTML5, this API allows you to manipulate classes more efficiently. However, its availability is limited to modern browsers.

**Library Usage**
In the provided benchmark code, there is no explicit library usage.

**Special JS Feature/ Syntax**
There are no special JavaScript features or syntax being tested in this benchmark. The focus is on comparing two basic method calls: `setAttribute()` and `classList.add()`.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0

Browser/OS: Firefox 91 on Windows

View result in a separate tab

Test name	Executions per second
setAttribute	1943408.0 Ops/sec
classList	1477105.9 Ops/sec

Related benchmarks:

setAttribute, classList (version: 0)

Comparing performance of: setAttribute vs classList

Created: 2 years ago by: Guest

Jump to the latest result

setAttribute

classList

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):